int c_long2str(int* v,int lv,int w,char** buf);
int c_str2long(char* s,int ls,int w,int** res);
int c_xxtea_encrypt(char* str,int lstr,char* key,int lkey,char** res);
int c_xxtea_decrypt(char* str,int lstr,char* key,int lkey,char** res);
